The Glock 21 Gen 4 is a full-size semi-automatic pistol chambered in .45 ACP, known for its reliability, durability, and proven Glock design. The Gen 4 model features an interchangeable backstrap system, aggressive grip texturing, and a reversible magazine release. This pistol comes with the factory Glock case and three magazines. Overall, the firearm is in good condition with some signs of normal handling and use throughout. A solid example of Glock's popular full-size .45 ACP platform.